#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
typedef pair<P, P> PP;
const int mod = 1000000007;
const int INF = 1e18;

int gcd(int a, int b){
    if(a < b) swap(a, b);
    if(b == 0) return a;
    return gcd(b, a % b);
}

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    int n;
    cin >> n;
    if(a * d - b * c == 0){
        set<P> st;
        rep(i, 0, n){
            int x, y;
            cin >> x >> y;
            P v;
            v.first = a * y - b * x;
            v.second = a;
            int G = gcd(abs(v.first), abs(v.second));
            v.first /= G;
            v.second /= G;
            st.insert(v);
        }
        cout << st.size() << endl;
        return 0;
    }
    set<PP> st;
    rep(i, 0, n){
        int x, y;
        cin >> x >> y;
        P u, v;
        u.second = v.second = a * d - b * c;
        u.first = d * x - c * y;
        v.first = a * y - b * x;
        if(u.second < 0){
            u.first *= -1;
            u.second *= -1;
            v.first *= -1;
            v.second *= -1;
        }
        int G = gcd(abs(u.first), abs(u.second));
        u.first /= G;
        u.second /= G;
        u.first = (u.first % u.second + u.second) % u.second;
        G = gcd(abs(v.first), abs(v.second));
        v.first /= G;
        v.second /= G;
        v.first = (v.first % v.second + v.second) % v.second;
        st.insert({u, v});
    }
    cout << st.size() << endl;
}